April 2016 - Users - libvirt List Archives

[libvirt-users] bridge / ubuntu / no arp reply
by François Chenais 15 Oct '26

15 Oct '26

Hello I'm trying to setup a bridged guest on an ubuntu 13.10 but it doesn't work. (Everything is ok with NAT) Network sniffing shows that arp replies don't come back to the guest. Test 1 ------ Guest : ping host_bridge_ip (ok) Test 2 ------ Guest: ping other_lan_host (KO) other_lan_host - receives arp who-is request - sends arp reply - arp -a shows the guest macaddr => Guest doesn't receive reply Test 3 ------ other_lan_host ping the Guest (KO) - arp -a shows "incomplete" addr - Guest receives nothing On Host ------- network tcpdump on bridge or vnet interfaces shows request but no reply ... Thanks in advance for help or ideas François

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[libvirt-users] ceph rbd pool and libvirt manageability (virt-install)
by Jelle de Jong 28 Aug '18

28 Aug '18

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello everybody, I created a rbd pool and activated it, but I can't seem to create volumes in it with virsh or virt-install? # virsh pool-dumpxml myrbdpool <pool type='rbd'> <name>myrbdpool</name> <uuid>2d786f7a-2df3-4d79-ae60-1535bcf1c6b5</uuid> <capacity unit='bytes'>6997998301184</capacity> <allocation unit='bytes'>10309227031</allocation> <available unit='bytes'>6977204658176</available> <source> <host name='ceph01.powercraft.nl' port='6789'/> <host name='ceph02.powercraft.nl' port='6789'/> <host name='ceph03.powercraft.nl' port='6789'/> <name>libvirt-pool</name> <auth type='ceph' username='libvirt'> <secret uuid='029a334e-ed57-4293-bb99-ffafa8867122'/> </auth> </source> </pool> # virt-install --version 1.0.1 # virsh --version 1.2.9 I ended using virsh edit ceph-test.powercraft.nl and making creating the disk manually. <disk type='network' device='disk'> <auth username='libvirt'> <secret type='ceph' uuid='029a334e-ed57-4293-bb99-ffafa8867122'/> </auth> <source protocol='rbd' name='libvirt-pool/kvm01-storage'> <host name='ceph01.powercraft.nl' port='6789'/> <host name='ceph02.powercraft.nl' port='6789'/> <host name='ceph03.powercraft.nl' port='6789'/> </source> <target dev='vdc' bus='virtio'/> </disk> I use virt-install a lot to define, import and undefine domains, how can I use virt-install to manage my rdb disks? Kind regards, Jelle de Jong -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iJwEAQECAAYFAlV1xlQACgkQ1WclBW9j5HkbPQP+PjNrzvlqysslOp2Yk7wH4Mxy 2sh2dn96G0KOAHEeEn3BN6IWlnD1TADZbHdpTtMwkdv48Xwn0sP1s+3QDM4pb3gP n+z+dVxS8FouDIy/eiso3IBCj3g4TWbEX8ZHqs3jKqe0lZgAXBzB9xYSUowcEBrZ ddkPbr8p8ozWyOG+9V8= =lkK7 -----END PGP SIGNATURE-----

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[libvirt-users] virRandomBits - not very random
by Brian Rak 01 Jun '18

01 Jun '18

I just ran into an issue where I had about 30 guests get duplicate mac addresses assigned. These were scattered across 30 different machines. Some debugging revealed that: 1) All the host machines were restarted within a couple seconds of each other 2) All the host machines had fairly similar libvirtd pids (within ~100 PIDs of each other) 3) Libvirt seeds the RNG using 'time(NULL) ^ getpid()' This perfectly explains why I saw so many duplicate mac addresses. Why is the RNG seed such a predictable value? Surely there has to be a better source of a random seed then the timestamp and the pid? The PID seems to me to be a very bad source of any randomness. I just ran a test across 60 of our hosts. 43 of them shared their PID with at least one other machine.

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[libvirt-users] stream finish throws exception via python API
by Shahar Havivi 27 Nov '16

27 Nov '16

Hi, The following snippet works fine e.g. receiving the data but when calling stream.finish() we get the following error: stream = con.newStream() vol.download(stream, 0, 0, 0) buf = stream.recv(1024) stream.finish() libvirt: I/O Stream Utils error : internal error: I/O helper exited abnormally Traceback (most recent call last): File "./helpers/kvm2ovirt", line 149, in <module> download_volume(vol, item[1], diskno, disksitems, pksize) File "./helpers/kvm2ovirt", line 102, in download_volume stream.finish() File "/usr/lib64/python2.7/site-packages/libvirt.py", line 5501, in finish if ret == -1: raise libvirtError ('virStreamFinish() failed') libvirt.libvirtError: internal error: I/O helper exited abnormally Am I doing something wrong? Thank you, Shahar.

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[libvirt-users] unhelpful error message on failed "virsh migrate"
by Andreas Buschmann 01 Jun '16

01 Jun '16

Hello, I have two servers where I can push VMs from one to the other by issuing the command virsh migrate --live --persistent --copy-storage-all --verbose \ test6 qemu+ssh://kvmhost2/system on kvmhost1. I can get the VM back by issuing the equivalent command on kvmhost2: virsh migrate --live --persistent --copy-storage-all --verbose \ test6 qemu+ssh://kvmhost1/system After an update (on behalf of the glibc bug) it only works for some VMs and fails for others. The error message is unhelpful: virsh --debug 4 migrate --live --persistent --copy-storage-all --verbose \ vmware-mgmt qemu+ssh://kvmhost1/system error: internal error: info migration reply was missing return status Is there a way to get a more helpful error message? migrating VMs only works for a very limited subset of the VMs on the system in the direction kvmhost2 --> kvmhost2 Stopping the VMs, copying them over to kvmhost1 and restarting still works, and I can even migrate them back. How do I debug this problem? One possible way would be to stop all VMs on kvmhost2, manually copy them to kvmhost1 and start them and afterwards reinstall all packages (or the whole Server if that doesn't help) But that would be a workaround, and I still would not know what the problem is. The system is CentOS 7.2 now and was CentOS 7.1 before the upgrade, with the qemu-kvm-rhev repo added for qemu. Mit freundlichen Gruessen Andreas Buschmann -- Andreas Buschmann [Senior Systems Engineer] net.DE AG

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[libvirt-users] I have ping through bridge , net has been started , But IPs they're not equivalent.
by Mohsen Pahlevanzadeh 29 Apr '16

29 Apr '16

Dear All, I have the following configuration and I have ping from bridge : ///////////////////////////////////////////////////// iface eth0 inet static address 192.168.1.4 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.1.255 gateway 192.168.1.1 auto ivbr0 iface ivbr0 inet static address 192.168.1.4 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.1.255 gateway 192.168.1.1 bridge_ports eth0 bridge_stp on bridge_maxwait 0 bridge_fd 0 ///////////////////////////////////////////// # brctl show bridge name bridge id STP enabled interfaces ivbr0 8000.18037360b44e yes eth0 ///////////////////////////////////////////// my network xml file : <network> <name>myintranet</name> <uuid>465ce6cb-0a69-4f89-92ba-629349741e73</uuid> <forward mode='nat'> <interface dev="eth0" /> </forward> <bridge name='ivbr0' stp='on' delay='0' /> <mac address='52:54:00:0f:f4:f0'/> <ip address='192.168.1.4' netmask='255.255.255.0'> <dhcp> <range start='192.168.1.3' end='192.168.122.254'/> </dhcp> </ip> </network> //////////////////////////////////////////// Now , I have ping of my modem and internet. Then I did the following command : # ip l set dev ivbr0 down # brctl delbr ivbr0 # virsh net-start myintranet Network myintranet started According to above , myintranet network has been started. But with the following IP address : # ip a show dev ivbr0 17: ivbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default link/ether 52:54:00:0f:f4:f0 brd ff:ff:ff:ff:ff:ff inet 192.168.122.1/24 brd 192.168.122.255 scope global ivbr0 valid_lft forever preferred_lft forever //////// 192.168.122.1 ? Question is , Where I change this address?(I set in myxml file.) --best regards Mohsen

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[libvirt-users] virsh and disable interface
by Mohsen Pahlevanzadeh 29 Apr '16

29 Apr '16

Dear All, According to http://wiki.libvirt.org/page/Networking#Debian.2FUbuntu_Bridging May be I have to do "ifdown eth0" How can I define, edit or other task live? ---mohsen

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[libvirt-users] vhost-user libvirt 1.2.18 issue
by chintu hetam 28 Apr '16

28 Apr '16

Hello there, i am trying to start my VM with 2 virtio interfaces as a vhost-user interface Following is my relevant xml network configuration " <interface type='vhostuser'> <mac address='52:54:00:c7:ac:38'/> <source type='unix' path='/tmp/vhost1.sock' mode='server'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/> </interface> <interface type='vhostuser'> <mac address='52:54:00:9d:ea:73'/> <source type='unix' path='/tmp/vhost2.sock' mode='server'/> <model type='virtio'/> <address type='pci' domain='0x0000' bus='0x00' slot='0x0b' function='0x0'/> </interface>" when i execute virsh start domain_name command it starts and gets paused log shows it's stuck at n-pci,id=balloon0,bus=pci.0,addr=0x7 -msg timestamp=on QEMU waiting for connection on: disconnected:unix:/tmp/vhost1.sock,server is there anything i am missing? thank you in advance. -hardik-

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[libvirt-users] Use virt-* tools from within container?
by Ken D'Ambrosio 28 Apr '16

28 Apr '16

Hi, all. I've set up an LXC container for various Openstack admin chores, and now I'm being asked to have it used for importing qcow2 images -- on which we want to run utilities like virt-sparsify and virt-sysprep, first. Sadly, when I do that, it dies horribly, e.g., root@openstack-cli:/tmp# virt-sysprep -a cloud-image.qcow2 Examining the guest ... libguestfs: warning: supermin-helper -f checksum returned a short string Fatal error: exception Guestfs.Error("cannot find any suitable libguestfs supermin, fixed or old-style appliance on LIBGUESTFS_PATH (search path: /usr/lib/guestfs)") Is there a way around this? Or is the answer, "Don't do that in a container"? Thanks! -Ken P.S. /usr/lib/guestfs -- the only part of the error I can easily look into -- has more stuff in it than the system that does process virt-* commands properly. Here's what's there: excludelist make.sh packagelist supermin.d

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[libvirt-users] Networking issues with lxc containers in AWS EC2
by Peter Steele 27 Apr '16

27 Apr '16

I've created an EC2 AMI for AWS that essentially represents a CentOS 7 "hypervisor" image. I deploy instances of these in AWS and create an number of libvirt based lxc containers on each of these instances. The containers run fine within a single host and have no problem communicating with themselves as well as with their host, and vice versa. However, containers hosted in one EC2 instance cannot communicate with containers hosted in another EC2 instance. We've tried various tweaks with our Amazon VPC but have been unable to find a way to solve this networking issue. If I use something like VMware or KVM and create VMs using this same hypervisor image, the containers running under these VMs can communicate with with each other, even across different hosts. My real question is has anyone tried deploying EC2 images that host containers and have figured out how to successfully communicate between containers on different hosts? Peter

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